As an April Fools' Day prank, the curators of the British Library's Medieval and Earlier Manuscripts Blog wrote up an entirely straight-faced account of a "spine-tingling" discovery — a cookbook that details the proper way to prepare unicorn. This history-changing find is tinged with staid hyperbole of the highest order and some lovely artwork. Explains the British Library of this document:

Experts believe that the cookbook was compiled by Geoffrey Fule, who worked in the kitchens of Philippa of Hainault, Queen of England (1328-1369). Geoffrey had a reputation for blending unusual flavours – one scholar has called him "the Heston Blumenthal of his day" – and everything points to his hand being behind the compilation.

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After recipes for herring, tripe and codswallop (fish stew, a popular dish in the Middle Ages) comes that beginning "Taketh one unicorne". The recipe calls for the beast to be marinaded in cloves and garlic, and then roasted on a griddle. The cookbook's compiler, doubtless Geoffrey Fule himself, added pictures in its margins, depicting the unicorn being prepared and then served. Sarah J Biggs, a British Library expert on medieval decoration, commented that "the images are extraordinary, almost exactly as we'd expect them to be, if not better"